New power supply for crossfire? - Help

Hello,
I currently have a VTX HD 6870 radeon and want to purchase another one in order to crossfire the two Gpus,
I have a Corsair cx500 (500w). Do i require more watts for crossfire and if so how much? The other problem is that each VTX HD 6870 radeon requires two 6pins and therefore i would need a Psu with 4x 6pins to fully connect both Gpus. Can anyone recomend me a good psu with enough watts as well as 4x 6pins?

Thanks,
Eggy :)
8 answers Last reply
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  1. EggyDevil said:
    Hello,
    I currently have a VTX HD 6870 radeon and want to purchase another one in order to crossfire the two Gpus,
    I have a Corsair cx500 (500w). Do i require more watts for crossfire and if so how much? The other problem is that each VTX HD 6870 radeon requires two 6pins and therefore i would need a Psu with 4x 6pins to fully connect both Gpus. Can anyone recomend me a good psu with enough watts as well as 4x 6pins?

    Thanks,
    Eggy :)



    Hi - Yes you need a PSU with 4 pci-e connectors. But, need to know your
    budget $$ for the PSU to recommend.

    Tom
  2. Here is a solid choice that will work well for you: http://www.newegg.com/Product/Product.aspx?Item=N82E16817139010

    You should look for 750W on up if you plan on running 2 HD 6870s in Xfire. Each card will draw 12.6 amps from the +12V rail(s) when maxed out. The processor is also a major current user from the +12V rail(s). Which CPU are you using?
  3. A good 650W will do but as mentioned, need your budget input. Very good ones can be had between $80 and $120.
  4. EggyDevil said:
    Hello,
    I currently have a VTX HD 6870 radeon and want to purchase another one in order to crossfire the two Gpus,
    I have a Corsair cx500 (500w). Do i require more watts for crossfire and if so how much? The other problem is that each VTX HD 6870 radeon requires two 6pins and therefore i would need a Psu with 4x 6pins to fully connect both Gpus. Can anyone recomend me a good psu with enough watts as well as 4x 6pins?

    Thanks,
    Eggy :)


    Hi again - realhardtechX suggests 600w(no harm in more) for 2 6870's in CF,

    here's some 650w units to consider:

    http://www.newegg.com/Product/Product.aspx?Item=N82E16817139020 nets to $80

    http://www.newegg.com/Product/Product.aspx?Item=N82E16817139012 nets to $110

    http://www.newegg.com/Product/Product.aspx?Item=N82E16817207014 nets to $96
  5. clutchc said:
    Here is a solid choice that will work well for you: http://www.newegg.com/Product/Product.aspx?Item=N82E16817139010

    You should look for 750W on up if you plan on running 2 HD 6870s in Xfire. Each card will draw 12.6 amps from the +12V rail(s) when maxed out. The processor is also a major current user from the +12V rail(s). Which CPU are you using?


    my pc currently has a i7 2600k
  6. redtailed said:
    A good 650W will do but as mentioned, need your budget input. Very good ones can be had between $80 and $120.


    yes my max budget is 120$
  7. thanks a lot guys, really helped :))
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